Electrical Properties of Organometallic Perovskite Films

Abstract

The electrical properties of the films of organometallic perovskites CH₃NH₃PbBr₃ and CH₃NH₃PbI₃ were studied. Current–voltage characteristics for the CH₃NH₃PbBr₃ and CH₃NH₃PbI₃ samples were measured in a temperature range of 300–80 K, from which the temperature dependences of resistivity ρ(T) having characteristic points of inflection in a range of 160–240 K were determined. The activation energies of charge carriers prior to and after points of inflection were determined. It is assumed that the observed features in the temperature dependences of resistivity (temperature at the points of inflection) correlate with the temperatures of tetragonal-to-orthorhombic phase transitions for two studied organometallic perovskites (CH₃NH₃PbBr₃ and CH₃NH₃PbI₃).